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Over the last six weeks, President Obama has launched a sustained advertising blitz focused primarily in nine swing states – Colorado, Florida, Iowa, Nevada, New Hampshire, North Carolina, Ohio, Pennsylvania, and Virginia. Everybody is wondering: has it moved the needle in his direction?

These ads have not moved him up in the polls. The race is tied in the July 30 Gallup poll at 46%. Neither have the ads strengthened public approval of Mr. Obama's handling of the economy, which is stuck at 44% in the July 22 NBC/WSJ poll, nor have they erased Mr. Romney's seven-point lead in that poll regarding who has "good ideas for how to improve the economy.

More by Jay Cost

“The national numbers aren't changing much because Romney is actually gaining in the states that are not being bombarded with media. Yesterday’s Connecticut poll has Obama by only 8 for example. And red states seem to be getting even redder. This is happening because the daily news is about the economy, Washington problems, etc. and that is the main message getting through. So, polls in these states reflect how voters who only see national news and national advertising (to the degree there is any) respond.

“But.

“In the swing states they are being assailed with ads and campaigning, as well as the news. And here Obama seems to be building a bit of a margin. He now is ahead by solid margins in the most recent surveys in Ohio, Florida, Pennsylvania, Michigan, Nevada, Virginia, Iowa, Wisconsin and New Hampshire. It's very close in Colorado, and Romney has a slight lead in North Carolina."

This is a very real possibility, and entirely consistent with the data that Rove cites.

Writing yesterday at RealClearPolitics, Sean Trende argued that the swing state polls are not tilted to Obama. His weighted average of the 50 states plus the District of Columbia points to the same, modest nationwide lead that Obama sports in the nationwide polling.

Yet I think there is evidence the ad blitz is having a modest effect.

It’s a tough case to make because ultimately we are dealing with different types of polls from many different pollsters – on both the state and national level. The possibility for “house effects” is very high. One way around that is to look at one pollster who is polling on the state and national level. Fortunately, there is one pollster who does regular polling like this – Rasmussen Reports.

Over the last month – during the heyday of Obama’s ad blitz – Rasmussen has conducted a daily national tracking poll and also polled in five of the nine targeted states – Florida, Nevada, North Carolina, Ohio, and Virginia. This offers us an opportunity to see if Obama is doing better than we should “expect” him to.

But what to base those expectations on? We can look at 2008 – and, specifically, compare how Obama did in those states relative to the national average. We then take that to the 2012 polls to see if the president has enjoyed a boost. For instance, Obama did two points worse in Ohio than he did nationwide in 2008 (51 percent in the Buckeye State compared to 53 percent nationwide). So, we might “expect” Obama to be doing two points worse in the Rasmussen poll of Ohio than he did in the nationwide poll conducted at the same time.

Admittedly, this is a quick-and-dirty approach to answering our question. The method here is not compelling enough to draw any firm conclusions, but it can give us a sense.

What we see here is a slight bump in Obama’s numbers over what we would otherwise expect, amounting to about a 3 percent average improvement. Meanwhile, Romney’s support in these states is about 1 point lower than what we would expect, for a total swing of about 4 points.

As a point of comparison, Rasmussen has also polled in three swing states that have not (yet) received a sustained advertising blitz – Michigan, Missouri, and Wisconsin. In those three states Rasmussen found Obama doing 2 points better on average than expected and Romney doing 1.5 points better.

So, on net this data suggests that Obama has enjoyed a slight boost from his advertising. It is not determinative, only suggestive – and I encourage you to read Trende’s analysis carefully. He approaches the question from a different angle and arrives at a different conclusion.

Is this polling bump an important development? It is hard to say. It is worth noting that in the last two weeks, the Romney campaign and the main Republican super PAC, Crossroads GPS, have upped their ad spending in these states. That suggests they think it is time to engage the president.

But I am not at all convinced that, in the end, Obama is actually winning over voters. Above all, the truly undecided are not really paying attention at the moment. They might have been swayed toward Team Obama a little bit, but I doubt they have been locked down. That being said, I do believe that the president has successfully laid the groundwork for his general election strategy, which Greg Sargent ably summarizes here. Basically, it boils down to the idea that, though the state of the union stinks right now, Romney is an uncaring plutocrat who will make it worse for the middle class. These ads have clearly forwarded that agenda.

We should assume that every voter by Election Day will know this argument by heart. However, they will also be able to recite the Romney rejoinder. The positive side of that case will lean heavily on his biography as a businessman, Winter Olympics fixer, and bipartisan governor to argue that he is the right man to repair the economy.

Team Romney, for various reasons, has only begun to make that case, meaning that the real action has yet to begin.